On Wed, 13 Jun 2012, Matt Simerson wrote:
> https://github.com/smtpd/qpsmtpd/pull/29 Make sure the HELO hostname has an A or AAAA record that matches the senders IP address, and make sure that the senders IP has a PTR that resolves to the HELO hostname. This might sound pedantic, but since time immemorial, having matching DNS is a minimum standard expected, and frequently required, of mail servers. I think that "time immemorial" is hyperbole, "a minimum standard" is vague (expected by whom?) and "frequently required" is inaccurate - I think this is infrequently required by mail servers - it certainly isn't mandated by any RFC, or enforced by qpsmtpd.org (or you wouldn't be reading this message).
